OIML R 50-2 (E), Edition 1997 - TSAPPS at NIST STANDARD DRAFT SASO OIML R 50-2: 2011 OIML R 50-2:...

SAUDI STANDARD

DRAFT

SASO OIML R 50-2: 2011

OIML R 50-2: 1997

Continuous totalizing automatic weighing instruments (belt weighers)

Part 2: Test report format

SAUDI ARABIAN STANDARDS ORGANIZATION

THIS DOCUMENT IS A DRAFT SAUDI STANDARD CIRCULATED FOR

COMMENT. IT IS, THEREFORE SUBJECT TO CHANGE AND MAY NOT

BE REFERRED TO AS A SAUDI STANDARD UNTIL APPROVED BY THE

BOARD OF DIRECTORS.

- R 50-2 page 2

SAUDI STANDARD SASO OIML R 50-2/2011

CONTENTS

Foreword . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Identification of the instrument . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

General information concerning the pattern . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Summary of the checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Test report

Test equipment used for pattern evaluation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Configuration for test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Explanatory notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Summary of test report . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

1 Simulation tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Simulator data

1.1 Warm-up time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

1.2 Variation of simulation speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

1.3 Eccentric loading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

1.4 Zero-setting device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

1.4.1 Zero-setting (range) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

1.4.2 Zero-setting (semi-automatic and automatic) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

1.5 Influence quantities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

1.5.1 Static temperatures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

1.5.2 Temperature effect at zero flowrate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

1.5.3 Damp heat, steady state . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

1.5.4 Mains power supply (AC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

1.5.5 Battery power supply (DC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

1.6 Disturbances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

1.6.1 Voltage dips and short interruptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

1.6.2 Electrical fast transients/burst immunity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

1.6.3 Electrostatic discharges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

1.6.4 Electromagnetic susceptibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

1.7 Metrological characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

1.7.1 Repeatability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

1.7.2 Discrimination of the totalization indicating device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

1.7.3 Discrimination of the totalization indicating device used for zero totalization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

1.7.4 Short- and long-term stability of zero . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

1.8 In-situ tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

1.8.1 Maximum permissible errors on checking of zero . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

1.8.2 Discrimination of the indicator used for zero setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

2 In-situ material tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

2.1 Accuracy of control instrument . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

2.2 Repeatability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

SAUDI STANDARD SASO OIML R 50-2/2011

Foreword

The Saudi Arabian Standards Organization (SASO) has adopted the International

standard No. OIML R 50-2/1997 “Continuous totalizing automatic weighing

instruments (belt weighers)- Part 2: Test report format ” issued by the OIML. The

text of this international standard has been translated into Arabic so as to be

approved as a Saudi standard without introducing any technical modification.

1

- R 50-2 page 4 -

INTRODUCTION

The “Test report format”, the subject of OIML R 50-2, aims at presenting, in a standardized format, the results

of the various tests and examinations to which a pattern of a continuous totalizing automatic weighing instrument

(belt weigher) shall be submitted with a view to its approval.

The “Test report format” consists of two parts, the “Checklist” and the “Test report”.

The “Checklist” is a summary of the examinations carried out on the instrument. It includes the conclusions of

the results of the tests performed, experimental or visual checks based on the requirements of OIML R 50-1.

The words or condensed sentences aim at reminding the examiner of the requirements of R 50-1 without

reproducing them.

The “Test report” is a record of the results of the tests carried out on the instrument. The “Test report” forms

have been produced based on the tests detailed in the test procedures (Annex A of OIML R 50-1).

The “information concerning the test equipment used for pattern evaluation” shall cover all test equipment

which has been used in determining the test results given in a report. The information may be a short list

containing essential data (name, type, reference number for purpose of traceability). For example:

• Verification standards (accuracy or accuracy class, and No.);

• Simulator for testing of modules (name, type, traceability and No.);

• Climatic test and static temperature chamber (name, type and No.);

• Electrical tests, bursts (name of the instrument, type and No.);

• Description of the procedure of field calibration for the test of electromagnetic susceptibility.

All metrology services or laboratories evaluating patterns of continuous totalizing automatic weighing

instruments according to OIML R 50-1 or to national or regional regulations based on OIML R 50-1 are

strongly advised to use this “Test report format”, directly or after translation into a language other than English

or French. Its direct use in English or in French, or in both languages, is even more strongly recommended

whenever test results may be transmitted by the country performing these tests to the approving authorities of

another country, under bi- or multi-lateral cooperation agreements. In the framework of the OIML Certificate

System for measuring instruments, use of the “Test report format” is mandatory.

- R50-2page 5

Report page ..../....

Identification of the instrument

Application No.: .......................................................................

Report date: .......................................................................

Pattern designation: .......................................................................

Manufacturer: .......................................................................

Serial No.: .......................................................................

Manufacturing documentation

Drawing No. Issue level Build standard

Software reference Software revision level

Other system drawings

Simulator documentation

Drawing No. Issue level

Software reference Software revision level

Simulator function (summary)

Simulator description and drawings, block diagram etc. should be attached to the report if available.

- R 50-2 page 6 -


Identification of the instrument (continued)

Application No.: .......................................................................

Report date: .......................................................................


Manufacturer: .......................................................................

Description or other information pertaining to identification of the instrument:

(attach photograph here if available).

- R50-2page 7


General information concerning the pattern

Application No.: .......................................................................

Manufacturer: .......................................................................

Applicant: .......................................................................

Instrument category: .......................................................................

Testing on: Complete instrument Module (*)


Accuracy class 0.5 1 2

Speed (v) = m/s Qmin = �min =

Max = Qmax = d =

L = m

Unom(**) = V Umin = V Umax = V f = Hz Battery, U = V

Zero-setting device:

Nonautomatic

Semi-automatic

Automatic

Temperature range °C

(*) The test equipment (simulator or part of a complete instrument) connected to the module shall be defined in the test form(s)

used.

(**) The voltage Unom shall be as defined in IEC 1000-4-11 (1994) section 5.

- R 50-2 page 8 -


General information concerning the pattern (continued)

Printer:

Built in Connected Non present but connectable No connection

Instrument submitted: ....................................................

Identification No.:

....................................................

Connected equipment:

....................................................

Interfaces:

(number, nature) .....................................................

Load cell:

Manufacturer:

OIML R 60 Certificate of

conformity. Please tick

and if "Yes" supply

Certificate number.

Yes Certificate number

No

Type:

Capacity:

Number:

Classification symbol:

Remarks: see following page

Date of report: .....................................................

Evaluation period: .....................................................

Observer: .....................................................

- R50-2page 9

Report page ..../..

General information concerning the pattern (continued)

Use this space to indicate additional remarks and/or information: connecting equipment, interfaces and load cells, choice

of the manufacturer regarding protection against disturbances, etc.

- R 50-2 page 10

-


Passed

Failed

X

X

/

/

CHECKLIST

For each test, the "Summary of the checklist" and the "Checklist" shall be completed according to this example:

when the instrument has passed the test:

when the instrument has failed the test:

when the test is not applicable:

Summary of the checklist:

Requirement Passed Failed Remarks

Metrological requirements

R 50-1 clause 2

Technical requirements

R 50-1 clause 3

Requirements for electronic belt

weighers

R 50-1 clause 4

Metrological controls

R 50-1 clause 5

Test report

Overall result

- R50-2page 11

Report page ..../...

Summary of the checklist (remarks)

Use this page to detail remarks from the slllllmrny of the checklist

- R 50-2 page 12

-


Checklist

Application No.: ...............................................................................................................................

Pattern Designation: ...............................................................................................................................

Requirement

R 50-1 Test

procedure Belt weighers

Checklist

Passed

Failed

Remarks

2 METROLOGICAL REQUIREMENTS

2.2

2.2.1

2.2.2

2.2.3

Maximum permissible errors

A.11.2

Observe

A.7

Maximum permissible errors for automatic

weighing: do not exceed values in Table 1 (R 50-1)

rounded to nearest d

Difference between indicated or printed weighing

results: no difference between results

Maximum permissible errors for influence factor

tests: do not exceed the values in Table 2 (R 50-1)

rounded to nearest d

2.3 Minimum value of minimum totalized load (�min) � largest of the following: Observe 2 % of load totalized in 1 hour at maximum flowrate

the load obtained at maximum flowrate in one

revolution of the belt

the load corresponding to the appropriate number

of totalization scale intervals in Table 3

2.4 Minimum flowrate

Observe single speed belt weighers:

General Qmin = 20 % of Qmax

Particular installation : Qmin � 35 % of Qmax

Variable and multi-speed belt weighers may have

Qmin less than 20 % of Qmax and minimum

instantaneous net load � 20 % of Max

2.5

2.5.1

2.5.2

2.5.3

Simulation tests

A.6.3.1

A.6.3.2

A.6.3.4

Variation of simulation speed: errors do not exceed

mpe's for influence factor tests in 2.2.3 (R 50-1)

Eccentric loading: errors do not exceed values in

2.2.3 (R 50-1)

Zero-setting: totalization error does not exceed mpe

for influence factor tests in 2.2.3 (R 50-1)

2.5.4

2.5.4.1

2.5.4.2

2.5.4.3

2.5.4.4

Influence quantities

A.7.1

A.7.2

A.7.4

A.7.5

Static temperatures

Temperature effect at zero flowrate

Mains power supply (AC)

Battery power supply (DC)

- R50-2page 13


Requirement

R 50-1 Test


Checklist

Passed

Failed

Remarks

2.5.5

2.5.5.1

2.5.5.2

2.5.5.3

2.5.5.4

2.5.5.5

Metrological characteristics

A.9.1

A.9.2

Repeatability: difference between 2 results

obtained for the same load � mpe for

influence factor tests in 2.2.3 (R 50-1)

Discrimination of the totalization indicating device:

error is not more than specified in 2.6.3 (R 50-1)

A.9.3 Discrimination of the totalization indicating device used for zero totalization: 3 minute

test, visible differences between indications obtained at no load and for a load equal to:

0.05 % of Max for class 0.5

0.1 % of Max for class 1

0.2 % of Max for class 2

A.9.4 Short-term stability of zero: In 5 tests of 3 minutes, the difference between indications

must not exceed following percentage of load totalized in 1 hour at Qmax

0.0013 % for class 0.5

0.0025 % for class 1

0.005 % for class 2

A.9.4 Long-term stability of zero: Difference between smallest and largest of all indications

shall not exceed the following percentages of the load totalized in 1 hour at Qmax

0.0018 % for class 0.5

0.0035 % for class 1

0.007 % for class 2

2.6

2.6.1

2.6.2

2.6.3

In-situ tests

A.11.2 Repeatability: difference between relative errors

shall not exceed the absolute value of the

appropriate mpe for automatic weighing in 2.2.1 (R

50-1).

A.10.1 Maximum permissible errors on checking of zero: variations of the indication of zero do

not exceed the following percentage of the load totalized at max flowrate for the duration

of the test:

0.05 % for class 0.5

0.1 % for class 1

0.2 % for class 2 A.10.2 Discrimination of the indicator used for zero-setting: there must be a visible difference

between indications obtained at no load and for a load (deposited on or removed from

the load receptor) equal to:

0.05 % for class 0.5

0.1 % for class 1

0.2 % for class 2

- R 50-2 page 14

-


Requirement

R 50-1 Test


Checklist

Passed

Failed

Remarks

2.6.4 10.3 Maximum variation during zero-load test: the totalization indicator shall not vary from

the initial indicated value by more than the following percentage of the load totalized at

Qmax for the duration of the test when �min is less than 3 belt revolutions at Qmax: 0.18 % for class 0.5

0.35 % for class 1

0.7 % for class 2

3 Technical requirements

3.1 Observe Suitability for use

Instrument suits method of operation

Instrument suits materials

Instrument suits accuracy class

3.2

3.2.1

3.2.2

3.2.3

3.2.4

3.2.5

3.2.6

Observe Security of operation

Observe

Observe

Observe

Observe

Accidental maladjustment: effect is obvious

Operational adjustment: not possible for general

totalization indicating device to be reset to zero,

and

not possible to make operating adjustments or to

reset other trade indicating devices during an

automatic weighing operation.

Fraudulent use: no characteristics likely to facilitate

fraudulent use

Operating devices: cannot normally come to rest in

a position other than those intended unless all

indication and printing disabled

Observe

Observe

Conveyor interlock: If instrument is switched off/ceases to function:

conveyor stops

visible or audible signal is given

Remote indicating devices: out of range indication

is provided as specified in 3.4 (R 50-1).

3.3

3.3.1

3.3.2

Observe

Observe

Totalization indicating and printing devices

Quality of indication:

reliable

simple

non-ambiguous

by simple juxtaposition

name or symbol of appropriate unit of mass

Form of the scale interval: 1 × 10k, 2 × 10k or 5 × 10k

- R50-2page 15


Requirement

R 50-1 Test


Checklist

Passed

Failed

Remarks

3.3.3

3.3.4

3.3.5

3.3.6

Observe

Observe

Observe

Observe

Scale interval (d) of a partial totalization indicating

device: is equal to scale interval of the general

totalization indicating device

Scale interval of supplementary totalization

indicating devices: is at least equal to 10 times

totalization scale interval

Range of indication: at least one totalization

indicating device indicates a value equal to

quantity of product weighed in 10 hours of

operation at Qmax

Engagement of totalization indicating and printing

devices: permanently engaged

3.4 Observe Out-of-range indication: a continuous audible or visual indication shall be given when:

the instantaneous load is above the maximum

capacity of the weighing unit, or

the flowrate is above the maximum or below the

minimum value

3.5

3.5.1

Observe Zero-setting device: does not exceed 4 % of

maximum capacity

Semi-automatic and automatic zero-setting devices:

the setting to zero takes place after a whole number

of revolutions of the belt, and

the end of the zero-setting operation is indicated,

and

the limits of adjustment are indicated

shall be possible to disengage automatic zero-

setting devices during testing as appropriate

if an automatic zero-setting device is included must

have interlock to prevent zero-setting

3.6 Observe Displacement transducer

no possibility of slip whether the belt is loaded or

not

displacement sensing devices are driven by the

clean side of the belt

measurement signal to correspond with

displacement of belt equal to or less than weigh

length

adjustable parts can be sealed

3.7 Observe Belt weighers inclusive of conveyor

constructed in a rigid manner

shall form a rigid assembly

3.8 Observe Installation conditions (where applicable)

Instrument is installed where:

the frame support of the conveyor is constructed in

a rigid manner

- R 50-2 page 16

-


Requirement

R 50-1 Test


Checklist

Passed

Failed

Remarks

3.8.1

3.8.2

3.8.3

3.8.4

in any straight longitudinal section the roller track

is such that the belt is constantly supported on the

weighing rollers

belt cleaning devices, if fitted, are positioned and

operated so as to have no significant effect on the

results

roller track does not allow slippage to occur

Installation does not cause excessive additional

errors

Observe Roller track

is protected against corrosion and clogging

is aligned properly

Observe Conveyor belt

mass per unit length is practically constant

belt joints have no significant effect on the results

Observe Speed control

Single speed instruments:

speed of belt during weighing does not vary by

more than 5 % of nominal speed

Variable speed belt weighers (with speed setting control):

speed of the belt does not vary by more than 5 %

of the set speed

Observe Weigh length

remains unchanged in service

if adjustable, the adjusting devices can be sealed

3.8.5

3.8.6

3.9

Observe

Observe

Observe

Belt tension for belt weighers with weigh table: longitudinal tension is maintained

independent of the effects of:

temperature

wear

load

no slip between belt and driving drum

When conveyor length exceeds 10 m the roller that

transfers the force from the tensioner shall have an

arc at belt contact of not less than 90°

Overload protection: for accidental loads greater

than the maximum capacity

Ancillary devices: do not affect weighing results

- R50-2page 17


Requirement

R 50-1 Test


Checklist

Passed

Failed

Remarks

3.10 Observe Sealing: components not intended to be

adjusted/removed are fitted with sealing device or

are encased (casing used has a provision for

sealing)

3.11

3.11.1

3.11.2

3.11.3

3.11.4

Observe

Observe

Observe

Observe

Descriptive markings

Markings shown in full:

identification mark of the manufacturer

identification mark of the importer (if applicable)

serial number and type designation of the belt

weigher

the inscription: zero testing shall have a duration of

at least ..... revolutions

mains voltage ...V

mains frequency ...Hz

Markings in code:

- pattern approval sign

- accuracy class (0.5), (1) or (2)

- totalization scale interval d = ... kg or t

As appropriate

nominal speed(s) of the belt v = ... m/s, or

range of speeds of the belt v = .../... m/s

maximum flowrate Qmax = ... kg/h or t/h

minimum flowrate Qmin = ... kg/h or t/h

minimum totalized load �min = ... kg or t

Markings consequential to pattern evaluation:

designation of type(s) of product to be weighed

maximum capacity (Max) ... kg or t

weigh length (L) ... m

control value ... kg or t

temperature range ... °C/... °C

speed range of displacement simulation device

... m/s

operating frequency (if totalizing by addition)

... cycles/hour

identification mark on parts of the belt weigher not

directly attached to the main unit

Supplementary markings: as required by

metrological authority

Note in remarks

- R 50-2 page 18

-


Requirement

R 50-1 Test


Checklist

Passed

Failed

Remarks

3.11.5 Observe Presentation of descriptive markings

indelible Confirm

easily readable Confirm

grouped together in a clearly visible place either on

a descriptive plate near the general totalization

indicating device or on the indicating device itself.

Plate shall be sealable, unless it cannot be removed

without it being destroyed

Confirm

3.12

3.12.1

3.12.2

Observe Verification marks

Position of verification marks:

part on which it is located cannot be removed from

the belt weigher without damaging the marks

allows easy application of mark without changing

the metrological qualities of the belt weigher

is visible without the belt weigher or its protective

covers having to be moved when it is in service

Observe Mounting: Belt weighers required to have

verification marks shall have:

verification mark support, at the place provided for

above to ensure conservation of the marks

When the mark is made by a stamp, the support is a

strip of lead or other material with similar qualities

inserted into a plate fixed to the belt weigher or,

into a cavity in the belt weigher

space provided for adhesive transfer (if applicable)

4 Requirements for electronic belt weighers

4.1

4.1.1

4.1.2

4.1.3

4.1.4

General requirements

A.8

A.8.1

A.8.2

A.8.3

A.8.4

Observe

Observe

Rated operating conditions: errors do not exceed

mpe

Disturbances

Voltage dips and short interruptions

Electrical fast transients/burst immunity

Electrostatic discharges

Electromagnetic susceptibility

Durability: requirements of 4.1.1 and 4.1.2 shall be

met durably

Evaluation for compliance: instrument has passed

examination and tests specified in Annex A

- R50-2page 19


Requirement

R 50-1 Test


Checklist

Passed

Failed

Remarks

4.2

4.2.1

4.2.2

Observe Application: requirement in 4.1.2 may be applied

separately to:

Note in remarks

a) each individual cause of significant fault, and/or Note in remarks

b) each part of the electronic instrument Note in remarks

Choice above is made by the manufacturer Note in remarks

4.3 Observe Acting upon a significant fault

visual indication, or

audible indication is provided and continues until

user takes action or the fault disappears

totalized load information is retained when a

significant fault occurs

4.4 Observe Switch-on procedure: all relevant signs of

indicating devices are activated

4.5

4.5.1

4.5.2

4.5.3

4.5.4

4.5.5

4.5.6

Functional requirements

See A.7 Influence factors: complies with 2.5.4 (R 50-1), and

maintains its characteristics at a relative humidity

of 85 % at the upper limit of its temperature range

See A.8 Disturbances:

either difference in indications shall not exceed

value in T.5.5 (R 50-1), or

Note in remarks

instrument shall detect and act upon a significant

fault

Note in remarks

A.6.1.1 Warm-up time

no indication/transmission of results and automatic

operation is inhibited

Observe Interface: does not affect metrological functions

and instrument functions correctly

A.7.4 Mains power supply (AC): at power fail,

the metrological information (contained in the belt

weigher at the time of failure) is retained for at least

24 hours and displayed for at least 5 minutes

during that period and

the switch-over to emergency power supply shall

not cause a significant fault

A.7.5 Battery power supply (DC)

functions correctly when voltage drops below

specified minimum value, or

is automatically put out of service

- R 50-2 page 20

-


Requirement

R 50-1 Test


Checklist

Passed

Failed

Remarks

4.6

4.6.1

4.6.2

Observe

Observe

Examination and tests comply with applicable requirements and especially clause 4

Examinations: general appraisal of design and

construction

Performance tests: operates as specified in

Annex A

5 Metrological controls

5.1

5.1.1

5.1.2

5.1.3

5.1.3.1

Pattern evaluation

Observe Documentation

metrological characteristics of the belt weigher

a standard set of specifications for the belt weigher

functional description of components and devices

drawings, diagrams and general software

information

any document or other evidence that the belt

weigher complies with the requirements

Observe General requirements

at least one and not normally > 3 units that

represent the definitive pattern, one of these in a

form suitable for simulation testing in a laboratory

at least one unit installed at a typical site

Observe Pattern evaluation tests

complies with R 50-1, clause 2

complies with R 50-1, clause 3

complies with R 50-1, clause 4 if it is an electronic

belt weigher

tests conducted without unnecessary commitment

of resources

Note in remarks

Metrological authority permits the results of these

tests to be assessed for initial verification

Note in remarks

A.11 Material tests: In-situ material tests shall be done as follows:

in accordance with the descriptive markings Confirm

under the normal conditions of use for which the

instrument is intended

Confirm

with a quantity of the product not less than the

minimum test load

Confirm

at flowrates between the minimum and maximum

values

Confirm

at each belt speed for conveyors with more than

one fixed speed, or throughout the speed range for

variable speed conveyors

Confirm

in accordance with the test methods in A.11

(R 50-1)

- R50-2page 21


Requirement

R 50-1 Test


Checklist

Passed

Failed

Remarks

5.1.3.2

5.1.3.3

5.1.3.4

5.1.4

5.1.5

Observe

Observe

Minimum test load is the largest of the following values:

2 % of the load totalized in one hour at maximum

flowrate, or

Confirm

load obtained at maximum flowrate in one

revolution of the belt (not applicable when all

material test load readings are obtained over a

whole number of belt revolutions), or

Confirm

appropriate number of scale intervals for testing

given in R 50-1, 5.1.3.2, Table 4

Confirm

Tests for compliance with technical requirements:

tests performed to assess compliance with R 50-1,

clause 2

Confirm

A.6.3 Simulation tests: carried out in a way that will reveal a corruption of any weighing result.

Means of assessing results can be:

adaptation of the totalization indicating device, or Note in remarks

use of change point weights, or Note in remarks

any other means mutually agreed Note in remarks

Observe Provision for means of testing

Metrological Authority has been supplied with

sufficient means for testing

Confirm

Observe Place of testing

either on the premises of the Metrological

Authority, or

Confirm

any other suitable place, mutually agreed Note in remarks

- R 50-2 page 22

-

Report page ..../..

Use this page to detail remarks from the checklist

- R50-2page 23


TEST REPORT

Test equipment used for pattern evaluation

Application No.: ..........................................................................................................................

Report date:

..........................................................................................................................

Pattern designation:

..........................................................................................................................

Manufacturer:

..........................................................................................................................

List all test equipment used in this report:

Equipment name Manufacturer Type No. Serial No. Used for

(Test references)

- R 50-2 page 24

-


Configuration for test

Application No.: ..........................................................................................................................

Report date:

..........................................................................................................................


..........................................................................................................................

Manufacturer:

..........................................................................................................................

Use this space for additional information relating to equipment configuration, interfaces, data rates, load cells EMC

protection options etc., for the instrument and/or simulator.

- R50-2page 25


20.5 21.1

95:12:29 95:12:30

16:00:05 16:30:05

Explanatory notes

Meaning of symbols:

I = Indication of the belt weigher

th

In = n indication S = Static load

�S = Additional static load to next changeover point

T = Totalized load (calculated for simulation tests or controlled load for material tests)

L = Weigh length

E = I - T

E % = ( I - T ) ×

100

T

= Error as percentage for simulation tests

mpe = Maximum permissible error (absolute value)

EUT = Equipment under test

d = Totalization scale interval

P = I + 0.5 d - �S = Indication of the control instrument prior to rounding

Note:

For simulation tests T is calculated from the simulation test equipment and is the product of the static load S and pulse count

as indicated in the individual tests and test report sheet.

For material tests T is the indication of the control instrument prior to rounding, thus for material tests T = P.

The calculation of P is only relevant to the control instrument and the subsequent determination of T for material tests.

The name(s) or symbol(s) of the unit(s) used to express test results shall be specified on each form.

The boxes under the headings of the report should always be filled in according to the following example:

Temp:

At start At end

°C

Rel. h: %

Date:

Time:

yy:mm:dd

hh:mm:ss

where:

Temp = temperature

Rel. h = relative humidity

"Date" in the test reports refers to the date on which the test was performed.

In the disturbance tests, significant faults are faults greater than the absolute value of the appropriate maximum permissible

error for influence factor tests for a load equal to �min, for the designated class of the belt weigher.

- R 50-2 page 26

-


Summary of test report

Application No.: ......................................................................................................

Pattern designation: ......................................................................................................

R 50-2 Tests Report

page Passed Failed Remarks

1 Simulation tests - simulator data 1.1 Warm-up time 1.2 Variation of simulation speed 1.3 Eccentric loading 1.4 Zero-setting device 1.4.1 Zero-setting (range) 1.4.2 Zero-setting (semi-automatic and automatic) 1.5 Influence quantities 1.5.1 Static temperatures 1.5.2 Temperature effect at zero flowrate 1.5.3 Damp heat, steady state 1.5.4 Mains power supply (AC) 1.5.5 Battery power supply (DC) 1.6 Disturbances 1.6.1 Voltage dips and short interruptions 1.6.2 Electrical fast transients/burst immunity

1.6.2.1 Power supply lines 1.6.2.2 I/O circuits and communication lines 1.6.3 Electrostatic discharges

1.6.3.1 Direct application 1.6.3.2 Indirect application 1.6.4 Electromagnetic susceptibility 1.7 Metrological characteristics 1.7.1 Repeatability 1.7.2 Discrimination of the totalization indicating device 1.7.3 Discrimination of the totalization indicating device

used for zero totalization

1.7.4 Short- and long-term stability of zero 1.8 In-situ tests 1.8.1 Maximum permissible errors on checking of zero,

or maximum variation during zero load test

(depending on ratio rev/�min)

1.8.2 Discrimination of the indicator used for zero-

setting

2 In-situ material tests (fixed and all other speed belt

weighers)

2.1 Accuracy of control instrument 2.2 Repeatability

mpe for pattern evaluation mpe for initial verification and in-service

inspection.

- R50-2page 27


1 Simulation tests (R 50-1, 5.1.3.4 & A.6.3)

Simulator data

Application No.: ...............................................................................................


...............................................................................................

Date:

...............................................................................................

Observer:

...............................................................................................

Data Derivation Ref Value Units

Maximum flowrate Max at maximum speed Qmax

Totalization scale interval d

Zero-setting scale interval

Simulator resolution(*) d

Max weigh table capacity To obtain Qmax Max

Weigh length L m

Pulses per weigh length

Nominal speed or

Range of speeds

v = .. m/s

v = ../.. m/s

(**)

(*) Where:

Simulator resolution "d" is obtained by using one of the methods in the "Note" in R 50-1, 5.1.3.4. If other means are

agreed (including the error calculation method in R 50-1, A.4.2), they should be noted below.

(**) Insert other relevant data as necessary.

Detail formula for calculating totalized load for simulation tests:

example:

T Pulses transmitted × S


T =

DESCRIPTION OF SIMULATOR:

(Must include details of any differences from installed instruments)

- R 50-2 page 28

-


1.1 Warm-up time (R 50-1, 4.5.3 and A.6.1.2)

Application No.: ............................................................................................

Pattern designation: ............................................................................................

Observer: ............................................................................................

At start At end

Temp: °C

Rel. h: %

Date: yy:mm:dd

Time: hh:mm:ss

Resolution during test:

(smaller than d) ............................................................................................

Duration of disconnection

before test: ............................................................................................

Automatic zero-setting:

Non existent Not in operation Out of working range In operation

Weigh table load

% Max as defined in R 50-1, 2.4 Time

(*) Pulses Calculated

totalization

T

Indicated

totalization

I

Error

E %

Min load (nominally 20 % of Max) 0 min

Max capacity (Max)

Min load (nominally 20 % of Max)

Max capacity (Max)

Min load (nominally 20 % of Max)

Max capacity (Max)

Min load (nominally 20 % of Max) 30 min

Max capacity (Max) * Counted from the moment an indication first appears.

Where:

"Pulses" are the pulses sent by the displacement transducer (or simulator) to simulate belt movement


Pulses p er weigh length

E % ( I - T ) × 100

T

Remarks:

- R50-2page 29


1.2 Variation of simulation speed (R 50-1, 2.5.1 & A.6.3.1)

Application No.: ............................................................................................


Observer: ............................................................................................

At start At end


Temp: °C

Rel. h: %

Date: yy:mm:dd

Time: hh:mm:ss

(smaller than d) ............................................................................................

Belt speed or speed range = v.... m/s or = v..../...m/s

Load S

( ) Speed

m/s Flowrate

( /h) Revolutions

or

pulses

( )

Calculated

totalization

T

( )

Indicated

totalization

I

Difference

I - T

( )

Error

E %

Where:

“Revolutions” are the integral number of simulated belt revolutions

“Pulses” are the number of pulses sent by the displacement transducer (or simulator) to simulate belt movement



E % ( I - T ) × 100

T

Remarks:

- R 50-2 page 30

-


1.3 Eccentric loading (R 50-1, 2.5.2 & A.6.3.2)

Application No.:


Observer:

............................................................................................

............................................................................................

............................................................................................

At start At end


Temp: °C

Rel. h: %

Date: yy:mm:dd

Time: hh:mm:ss

(smaller than d) ............................................................................................

Location of test loads:

Provide the following information:

for a load equal to half Max, totalization I;min (expressed as number of "d") is either

• equal to .... d or,

• 5 times the appropriate value in R 50-1, 2.3 Table 3, .... d

Load S

( )

Pulses Calculated

totalization

T

( )

Indicated

totalization

I

( )

Difference

I - T

( )

E

%

Band 1

Band 2

Band 3

Where:

"Pulses" are the number of pulses sent by the displacement transducer (or simulator) to simulate belt movement



E % ( I - T ) × 100

T

Remarks:

- R50-2page 31


1.4 Zero-setting device (R 50-1, 3.5)

1.4.1 Zero-setting (range) (R 50-1, 3.5 & A.6.3.3)

Application No.: ............................................................................................


Observer: ............................................................................................

At start At end

Temp: °C

Rel. h: %

Date: yy:mm:dd

Time: hh:mm:ss


(smaller than d) ............................................................................................

Positive portion S1 Negative portion S2 Zero-setting range

S1 + S2

Weight added Re-zero

Yes/No

Weight removed Zero

Yes/No

Where:

S1 is the maximum load that can be re-zeroed (positive portion)

S2 is the maximum load that can be removed while the instrument can still be re-zeroed (negative portion)

Check: S1 + S2 � 4 % of Max

Remarks:

- R 50-2 page 32

-


1.4.2 Zero-setting (semi-automatic and automatic) (R 50-1, 2.5.3 & A.6.3.4)

Application No.:


Observer:

............................................................................................

............................................................................................

............................................................................................

At start At end


Temp: °C

Rel. h: %

Date: yy:mm:dd

Time: hh:mm:ss

(smaller than d) ............................................................................................

Load S

( )

Pulses Calculated

totalization

T

( )

Indicated

totalization

I

( )

Difference

I - T

( )

E

%

S1

S2

S3

S4

Where:

S1 = 50 % of positive zero-setting range

S2 = 100 % of positive zero-setting range

S3 = -50 % of negative zero-setting range

S4 = -100 % of negative zero-setting range




E % ( I - T ) × 100

T

Remarks:

- R50-2page 33


1.5 Influence quantities (R 50-1, 2.5.4 & A.7)

1.5.1 Static temperatures (R 50-1, 2.5.4.1 & A.7.1)

Application No.: ............................................................................................


Observer: ............................................................................................


(smaller than d)

............................................................................................

Confirm automatic zero-setting device is:

Non existent Not in operation Out of working range

Pre-test information

Flowrate

( /h)

Equivalent

pulses for

�min

Static load (S) for

�min

( ) Qmax

Qintermediate Q

min

Test results (Note at each “Q” the test is repeated)

Test 1 - Static temperature 20 °C

At start At end

Temp: °C

Rel. h: %

Date: yy:mm:dd

Time: hh:mm:ss

Q

( /h)

Load S

( )

Pulses Calculated

totalization

T

( )

Indicated

totalization

I

( )

Difference

I - T

( )

E

%

Qmin

Qintermediate

Qmax

Qmin

- R 50-2 page 34

-


1.5.1 Static temperatures (continued)

Test 2 - Static temperature specified high ( °C)

At start At end

Temp: °C

Rel. h: %

Date: yy:mm:dd

Time: hh:mm:ss

Q

( /h)

Load S

( )

Pulses Calculated

totalization

T

( )

Indicated

totalization

I

( )

Difference

I - T

( )

E

%

Qmin

Qintermediate

Qmax

Qmin

Test 3 - Static temperature specified low ( °C)

At start At end

Temp: °C

Rel. h: %

Date: yy:mm:dd

Time: hh:mm:ss

Q

( /h)

Load S

( )

Pulses Calculated

totalization

T

( )

Indicated

totalization

I

( )

Difference

I - T

( )

E

%

Qmin

Qintermediate

Qmax

Qmin

- R50-2page 35




At start At end

Temp: °C

Rel. h: %

Date: yy:mm:dd

Time: hh:mm:ss

Q

( /h)

Load S

( )

Pulses Calculated

totalization

T

( )

Indicated

totalization

I

( )

Difference

I - T

( )

E

%

Qmin

Qintermediate

Qmax

Qmin


At start At end

Temp: °C

Rel. h: %

Date: yy:mm:dd

Time: hh:mm:ss

Q

( /h)

Load S

( )

Pulses Calculated

totalization

T

( )

Indicated

totalization

I

( )

Difference

I - T

( )

E

%

Qmin

Qintermediate

Qmax

Qmin

- R 50-2 page 36

-



Where:




E % ( I - T ) × 100

T

Remarks:

- R50-2page 37


Report

page

(*)

Date Time

1.5.2 Temperature effect at zero flowrate (R 50-1, 2.5.4.2 & A.7.2)

Application No.: ............................................................................................


Observer: ............................................................................................


(smaller than d)

............................................................................................

Confirm automatic zero-setting device is:

Non existent Not in operation Out of working range

Temperature at start specified minimum ( ) °C

At start At end

Rel. h: %

Date: yy:mm:dd

Time: hh:mm:ss

Temp

°C

Pulses Indicated

totalization

I at start

( )

Indicated

totalization

I at end

( )

Change in

indication

( )

Start temp

End temp

Start temp

End temp

Start temp

End temp

Start temp

End temp

Start temp

End temp

Where:

temp = temperature

The difference between each start temperature and end temperature is to be 10 °C with the rate of temperature change not

to exceed 5 °C per hour.

Remarks:

(*) Indicate the report page of the relevant test where the temperature effect at zero flowrate and static temperature tests are conducted

together.

- R 50-2 page 38

-


1.5.3 Damp heat, steady state (R 50-1, 4.5.1 & A.7.3)

Application No.:


Observer:

............................................................................................

............................................................................................

............................................................................................


(smaller than d) ............................................................................................

Automatic zero-setting device is:



Flowrate

( /h)

Equivalent

pulses for

�min

Static load (S) for

�min

( ) Qmax

Qmin

Test results (note at each “Q” the test is repeated)

Initial test at reference temperature of 20 °C and relative humidity of 50 %

At start After 3 hrs At end

Temp: °C

Rel. h: %

Date: yy:mm:dd

Time: hh:mm:ss

Q

( /h)

Load S

( )

Pulses Calculated

totalization

T

( )

Indicated

totalization

I

( )

Difference

I - T

( )

E

%

Qmax

Qmin

- R50-2page 39


1.5.3 Damp heat, steady state (continued)

Test at specified high temperature ( °C), relative humidity 85 %

At start After 2 days At end

Temp: °C

Rel. h: %

Date: yy:mm:dd

Time: hh:mm:ss

Q

( /h)

Load S

( )

Pulses Calculated

totalization

T

( )

Indicated

totalization

I

( )

Difference

I - T

( )

E

%

Qmax

Qmin

Final test at reference temperature 20 °C, relative humidity 50 %

At start After 2 hrs At end

Temp: °C

Rel. h: %

Date: yy:mm:dd

Time: hh:mm:ss

Q

( /h)

Load S

( )

Pulses Calculated

totalization

T

( )

Indicated

totalization

I

( )

Difference

I - T

( )

E

%

Qmax

Qmin

Where:




E % ( I - T ) × 100

T

Remarks:

- R 50-2 page 40

-


1.5.4 Mains power supply (AC) (R 50-1, 2.5.4.3 & A.7.4)

Application No.:


Observer:

............................................................................................

............................................................................................

............................................................................................

At start At end


Temp: °C

Rel. h: %

Date: yy:mm:dd

Time: hh:mm:ss

(smaller than d) ............................................................................................



Marked nominal voltage, Un, or voltage range: V


Flowrate

( /h)

Equivalent

pulses for

�min

Static load (S) for

�min

( ) Qmax

Test results

Test 1 at reference voltage (*)

Q

( /h)

Load S

( )

Pulses Calculated

totalization

T

( )

Indicated

totalization

I

( )

Difference

I - T

( )

E

%

Qmax

Test 2 at reference voltage -15 %

Q

( /h)

Load S

( )

Pulses Calculated

totalization

T

( )

Indicated

totalization

I

( )

Difference

I - T

( )

E

%

Qmax

Test 3 at reference voltage +10 %

Q

( /h)

Load S

( )

Pulses Calculated

totalization

T

( )

Indicated

totalization

I

( )

Difference

I - T

( )

E

%

Qmax

(*) The reference voltage shall be as defined in IEC 1000-4-11 (1994).



- R 50-2 page 41 -

1.5.4 Mains power supply (AC) (continued)

Test 4 at reference voltage (*)

Q

( /h)

Load S

( )

Pulses Calculated

totalization

T

( )

Indicated

totalization

I

( )

Difference

I - T

( )

E

%

Qmax

Where:




E % ( I - T ) × 100

T

Remarks:


1.5.5 Battery power supply (DC) (R 50-1, 2.5.4.4, 4.5.6 & A.7.5)

Application No.:


Observer:

............................................................................................

............................................................................................

............................................................................................

At start At end

- R 50-2 page 42 -


Temp: °C

Rel. h: %

Date: yy:mm:dd

Time: hh:mm:ss

(smaller than d) ............................................................................................



Marked voltage V


Flowrate

( /h)

Equivalent

pulses for

�min

Static load (S) for

�min

( ) Qmax

Test results

Test 1 at reference voltage

Q

( /h)

Load S

( )

Pulses Calculated

totalization

T

( )

Indicated

totalization

I

( )

Difference

I - T

( )

E

%

Qmax

Test 2 at lower limit voltage +2 % (*)

Q

( /h)

Load S

( )

Pulses Calculated

totalization

T

( )

Indicated

totalization

I

( )

Difference

I - T

( )

E

%

Qmax

Where:




E % ( I - T ) × 100

T

Remarks:


- R 50-2 page 43 -


1.6 Disturbances (R 50-1, 4.5.2 & A.8)

1.6.1 Voltage dips and short interruptions (R 50-1, 4.5.2 & A.8.1)

Application No.: ............................................................................................


Observer: ............................................................................................

At start At end

Temp: °C

Rel. h: %

Date: yy:mm:dd

Time: hh:mm:ss


(smaller than d) ............................................................................................


Marked nominal voltage Un or voltage range: V

Flowrate

( /h)

Equivalent

pulses for

�min

Static load (S) for

�min

( ) Qmax

Test results

Disturbance

Amplitude (*)

% of Un Duration

cycles Number of

disturbances Repetition

interval

(s)

Pulses Indication

I

( )

Significant

fault

No/Yes

without disturbance

0 0.5 10

50 1 10

Remarks:

- R 50-2 page 44 -


1.6.2 Electrical fast transients/burst immunity (R 50-1, 4.5.2 & A.8.2)

1.6.2.1 Power supply lines

Application No.: ............................................................................................


Observer: ............................................................................................

At start At end

Temp: °C

Rel. h: %

Date: yy:mm:dd

Time: hh:mm:ss


(smaller than d) ............................................................................................


Flowrate

( /h)

Equivalent

pulses for

�min

Static load (S) for

�min

( ) Qmax

Test results

Power supply lines: test voltage 1 kV, duration of the test 1 min at each polarity

L = live, N = neutral, PE = protective earth

Connection Polarity L

ground

N

ground

PE

ground

Pulses Indicated

totalization

I

( )

Significant

fault

Yes/No

without disturbance

X

pos neg

without disturbance

X

pos neg

without disturbance

X

pos

neg

Remarks:


- R 50-2 page 45 -

1.6.2 Electrical fast transients/burst immunity (continued)

1.6.2.2 I/O circuits and communication lines

Application No.: ............................................................................................


Observer: ............................................................................................

At start At end

Temp: °C

Rel. h: %

Date: yy:mm:dd

Time: hh:mm:ss


(smaller than d) ............................................................................................


Flowrate

( /h)

Equivalent

pulses for �min

Static load (S) for

�min

( ) Qmax

Test results

I/O signals, data and control lines: test voltage 0.5 kV, duration of the test 1 min at each polarity

Cable/interface Polarity Pulses Indicated

totalization

I

( )

Significant

fault

Yes/No

without disturbance

pos neg without disturbance





pos

neg Explain or make a sketch indicating where the clamp is located on the cable; if necessary, use an additional page.

Remarks:


- R 50-2 page 46 -

1.6.3 Electrostatic discharges (R 50-1, 4.5.2 & A.8.3)

1.6.3.1 Direct application

Application No.: ............................................................................................


Observer: ............................................................................................

At start At end

Temp: °C

Rel. h: %

Date: yy:mm:dd

Time: hh:mm:ss


(smaller than d) ............................................................................................


Flowrate

( /h)

Equivalent

pulses for

�min

Static load (S) for

�min

( ) Qmax

Contact discharge Paint penetration

Air discharge Polarity (*): pos neg

Discharges

Pulses

Indicated

totalization

I

( )

Significant

fault

Yes/No

Test

voltage

(kV)

Number of

discharges

� 10

Repetition

interval (s)

without disturbance

2

4

6

8 (air discharges)

Note: If the EUT fails, the test point at which this occurs shall be recorded.

Remarks:

(*) IEC 1000-4-2 specifies that the test shall be conducted with the most sensitive polarity.


(*) IEC 1000-4-2 specifies that the test shall be conducted with the most sensitive polarity.

- R 50-2 page 47 -

1.6.3 Electrostatic discharges (continued)

1.6.3.2 Indirect application (contact discharges only)

Application No.: ............................................................................................


Observer: ............................................................................................

At start At end

Temp: °C

Rel. h: %

Date: yy:mm:dd

Time: hh:mm:ss


(smaller than d) ............................................................................................


Flowrate

( /h)

Equivalent

pulses for

�min

Static load (S) for

�min

( ) Qmax

Polarity (*): pos neg

Horizontal coupling plane

Load S

( ) Discharges

Test

voltage

(kV)

Number of

discharges

:2 10

Repetition

interval (s) Indicated

totalization

I

Significant

fault

Yes/No

without disturbance 2 4

6

Vertical coupling plane

Load S

( ) Discharges

Test

voltage

(kV)

Number of

discharges

:2 10

Repetition

interval (s) Indicated

totalization

I

Significant

fault

Yes/No

without disturbance

2

4

6 Remarks:

Note: If the EUT fails, the test point at which this occurs shall be recorded.


- R 50-2 page 48 -

1.6.3 Electrostatic discharges (continued)

Specification of test points of EUT (direct application), e.g. by photos or sketches

a) Direct application

Contact discharges:

Air discharges:

b) Indirect application


- R 50-2 page 49 -

Flowrate

( /h)

Equivalent

pulses for

�min

Static load (S)

for �min

( ) Qmax

1.6.4 Electromagnetic susceptibility (R 50-1, 4.5.2 & A.8.4)

Application No.: ............................................................................................


Observer: ............................................................................................

At start At end

Temp: °C

Rel. h: %

Date: yy:mm:dd

Time: hh:mm:ss


(smaller than d) ............................................................................................


Rate of sweep:

Disturbance Result

Antenna Frequency

range (MHz)

Polarization Facing

EUT

Pulses

Indication Significant fault

Yes/No (remarks)

without disturbance

Vertical

Front

Right

Left

Rear

Horizontal

Front

Right

Left

Rear

Vertical

Front

Right

Left

Rear

Horizontal

Front

Right

Left

Rear

Remarks:

Note: If EUT fails, the frequency and field strength at which this occurs shall be recorded.


- R 50-2 page 50 -

Load S

Pulses

T

Indicated total

Difference

I - I Run 1 I1 Run 2 I2

1.7 Metrological characteristics (R 50-1, 2.5.5)

1.7.1 Repeatability (R 50-1, 2.5.5.1 & A.9.1)

Application No.: ............................................................................................


Observer: ............................................................................................

At start At end

Temp: °C

Rel. h: %

Date: yy:mm:dd

Time: hh:mm:ss


(smaller than d) ............................................................................................


Equivalent

pulses for

�min at S

Static load

(S)

( )

20 % Max =

50 % Max =

75 % Max =

Max =

1 2

Where:




Remarks:

- R 50-2 page 51 -


1.7.2 Discrimination of the totalization indicating device (R 50-1, 2.5.5.2 & A.9.2)

First weightable

load

S1

Pulses Increased

load

S2

Pulses Calculated totalized

load Indicated totalized

load Difference

(I - I ) T1 T2 I1 I2

20 % Max =

50 % Max =

75 % Max =

Max =

Application No.: ............................................................................................


Observer: ............................................................................................

At start At end

Temp: °C

Rel. h: %

Date: yy:mm:dd

Time: hh:mm:ss


(smaller than d) ............................................................................................


Equivalent

pulses for �min

at S1

Static load

(S1)

( )

20 % Max =

50 % Max =

75 % Max =

Max =

2 1

Where:

S1 = first weightable load

Existing load × 0.18 % for class 0.5

S2 Existing load × 0.35 % for class 1

Existing load × 0.7 % for class 2




Remarks:

- R 50-2 page 52 -


1.7.3 Discrimination of the totalization indicating device used for zero totalization

(R 50-1, 2.5.5.3 & A.9.3)

Application No.: ............................................................................................


Observer: ............................................................................................

At start At end

Temp: °C

Rel. h: %

Date: yy:mm:dd

Time: hh:mm:ss


(smaller than d) ............................................................................................

Test duration = 3 minutes, equivalent pulses =

Test Initial total

T1

( )

Pulses Final total

T2

( )

Pulses Difference

T1 - T2

( )

Weight added

1

2+

3

4+

5

6+

Weight removed

7+

8

9+

10

11+

12

Where:

+ indicates presence of test weight on weightable

Test weight

Remarks:

0.05 % of M ax for class 0.5 0.1 % of M ax for class 1 0.2 % of M ax for class 2

- R 50-2 page 53 -


1.7.4 Short- and long-term stability of zero (R 50-1, 2.5.5.4 & 2.5.5.5 & A.9.4)

Application No.: ............................................................................................


Observer: ............................................................................................

At start At end

Temp: °C

Rel. h: %

Date: yy:mm:dd

Time: hh:mm:ss


(smaller than d) ............................................................................................

Elapsed

time in

min

ZTID

indication Load

totalized in

3 min

Elapsed

time in

min

ZTID

indication Load

totalized

in 3 min

0 195

3 198

6 201

9 204

12 207

15 210

Where ZTID = Zero totalization indicating device

Remarks:

- R 50-2 page 54 -


1.8 In-situ tests (R 50-1, 5.2.1.1)

In-situ data Location details:

Application No.:

Pattern designation: Observer: Date:

Data

Derivation Data

Ref.

Value

Units

Totalization scale interval d

Scale interval for zero-setting From the device used for zero indication

Maximum capacity Maximum net load of weightable Max

Belt speed Maximum speed Vmax m/s

Minimum speed Vmin m/s

Maximum flowrate Max x Vmax Qmax kg/h or t/h

Minimum flowrate Normally 20 % of Qmax, but > 35 % of

Qmax Qmin kg/h or t/h

Weigh length L m

Length of belt B m

Time per belt revolution Minimum = B/Vmax s

Maximum = B/Vmin s

Load for one belt revolution at Qmax Qmax

× B

Vmax

(1) kg or t

2 % of the load at Qmax for 1 hour 0.02 × load at Qmax (2) kg or t

Table 3 (R 50-1) 800 d for class 0.5 400 d for class 1 200 d for class 2

(3) kg or t

Minimum totalized load Largest of (1), (2) and (3) �min kg or t

Minimum test load = �min unless all totalizations are

over whole belt revolutions, then

�t = largest of (2) and (3)

�t

kg or t

*

* Insert other relevant data as necessary.

COMMENTS ON SITE CONDITIONS (e.g. environmental protection of belt weigher, weather conditions, material weighed):


- R 50-2 page 55 -

1.8.1 Maximum permissible errors on checking of zero (R 50-1, 2.6.2 & A.10.1 or A.10.3) and, where �min is equal

to or less than 3 belt revolutions at Qmax

Maximum variation during zero-load test (R 50-1, 2.6.4 & A.10.3)

Application No.: ............................................................................................


Observer: ............................................................................................

At start At end

Temp: °C

Rel. h: %

Date: yy:mm:dd

Time: hh:mm:ss


(smaller than d) ............................................................................................

Note:

When �min is equal to or less than 3 belt revolutions at Qmax use the indication from the totalization indicator and tick this box.

In all other cases the indication shall be from the indication device used for zero setting (tick this box).

Test No. Belt

revolutions Duration

(secs) Initial

indication

I1

Final

indication

I2

Difference

I2 - I1

1

2

Where a separate zero (test) totalization indication device (ZTID) is provided and �min is equal to or less than 3

belt revolutions at Qmax then the following table should also be completed.

Test No.

Initial

indication

I1

Maximum

indication

Imax

Minimum

indication

Imin

*I1 - Imax*

(A)

*I1 - Imin*

(B)

Greater of

(A) or (B)

1

2

Remarks:


1.8.2 Discrimination of the indicator used for zero-setting (R 50-1, 2.6.3 & A.10.2)

Application No.:


Observer:

............................................................................................

............................................................................................

............................................................................................

At start At end

- R 50-2 page 56 -

Test Load SD

( ) Revs Duration

( ) Indication Difference

I - I I1 I2

A

B

A

B

A

B

A

B


Temp: °C

Rel. h: %

Date: yy:mm:dd

Time: hh:mm:ss

(smaller than d) ............................................................................................

1 2

Where:

Revs is revolution of the belt

SD is discrimination = load S

D

0.05 % of M ax for class 0.5 0.1 % of M ax for class 1 0.2 % of M ax for class 2

Remarks:


- R 50-2 page 57 -

2 In-situ material tests (R 50-1, 2.6.1 & 5.1.3.1 & 5.2.1.1 & A.11)

2.1 Accuracy of control instrument (R 50-1, 5.2.1.1 & A.11.1)

Application No.: ........................................................................... Pattern designation: ........................................................................... Scale interval, d: ........................................................................... Maximum capacity: ........................................................................... Minimum capacity: ........................................................................... Observer: ...........................................................................


At start At end

Temp: °C

Rel. h: %

Date: yy:mm:dd

Time: hh:mm:ss

(smaller than d) .....................................................................

Control instrument details: Belt weigher details:

Type .................................................... �min ....................................................................

Class ................

Max capacity

....................................

.................................

�t (if different) ....................................................

Where �t is the minimum test load defined in R 50-1, 5.1.3.2.

Min capacity

.................................

Scale interval, dc

.................................

Approval No.

.................................

Transfer vehicle: .......................................

Date of last test

................................

Capacity: .......................................

REQUIREMENT:

The control method used for material tests shall enable determination of the weight of the product used for testing with an

error not exceeding one-third of the appropriate maximum permissible error for automatic weighing in R 50-1, 2.2.1.

Example:

Number of weighings on control instrument

(One gross, one tare for each load)

2 � t N

Vehicle capacity

Number of scale intervals for one

Possible control instrument error

(Class III) per weighing

Vehicle gross load m

dc

± 0.5 dc

for 0 � m � 500

± 1.0 dc

for 500 � m � 2000 Ec

± 1.5 dc

for 2000 � m

Requirement

mpe% × �

× 1/3 � N × E

100 t c

where N is an adjustment for the probable error of N partial weighings.

The metrological authority may want to take into consideration other factors such as journey distance, weather, material loss

on route, etc.

- R 50-2 page 58 -


2.2 Repeatability (R 50-1, 2.6.1 & A.11.2.1)

Application No.:


Observer:

............................................................................................

............................................................................................

............................................................................................

At start At end


Temp: °C

Rel. h: %

Date: yy:mm:dd

Time: hh:mm:ss

(smaller than d) ............................................................................................

Note:

For multi-speed or variable-speed belt weighers the tests should be repeated as indicated in R 50-1, A.11.2.2 & A.11.2.3. A

continuation test sheet is provided overleaf.

Test

pair Controlled

load

T

Indication

I

( )

Feed

flowrate

( /h)

Error

I - T

( )

Relative

error

%

Relative

error

difference

%

1

2

3

4

5

Note: To be used to determine the following:

mpe for pattern evaluation (R 50-1, 5.1.3.1 & A.11.2.2);

mpe for initial verification and in-service inspection (R 50-1, 5.2.1.1).

Remarks:

- R 50-2 page 59 -


Continuation test sheet

Speed = m/s

Test

pair Controlled

load

T

Indication

I

( )

Feed

flowrate

( /h)

Error

I - T

( )

Relative

error

%

Relative

error

difference

%

1

2

3

4

5

Speed = m/s

Test

pair Controlled

load

T

Indication

I

( )

Feed

flowrate

( /h)

Error

I - T

( )

Relative

error

%

Relative

error

difference

%

1

2

3

4

5

Remarks:

OIML R 50-2 (E), Edition 1997 - TSAPPS at NIST STANDARD DRAFT SASO OIML R 50-2: 2011 OIML R 50-2:...

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